【判断题】【消耗次数：1】
三相交流电路中，无论负载是对称还是不对称，三相电路总的有功功率都等于各相负载的有功功率之和。
①
正确
②
错误
参考答案：
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相关题目
【单选题】
在三相交流电路中，当负载为对称且星型连接时，线电压与相电压的相位关系是
①
线电压超前相电压30度
②
线电压滞后相电压30度
③
线电压与相电压同相
④
线电压与相电压反相
【单选题】
在三相交流电路中，当负载为对称且三角型连接时，线电流与相电流的相位关系是
①
线电压超前相电压300
②
线电压滞后相电压300
③
线电流超前相电流300
④
线电流滞后相电流300
随机题目
【单选题】
What role does a teacher play in the following activity? While doing a writing task either individually or in groups, the students need to use a particular word they don’t know. So they ask the teacher.
①
Controller
②
Assessor
③
participant
④
Resource-provider.
【单选题】
What role does a teacher play in the following activity? The teacher asks a student a question “Have you ever bought clothes with problems?” If the student doesn’t seem to be ready, the teacher says “for example, a shirt without...” and points to the buttons on his own shirt or jacket.
①
Controller
②
Assessor
③
Organizer
④
Prompter.
【单选题】
What role does a teacher play in the following activity? T: do you have any hobbies? S: yes, I like singing and dancing. T: Uhm, and...? S: I also collect coins. T: Oh, really, how many...have you already...collected?
①
Controller
②
Assessor
③
Organizer
④
Prompter
【单选题】
Which of the following is the advantage of whole class work?
①
It is an ideal way to show materials and do presentations together
②
It allows students to work together rather than under teacher’s guidance.
③
There is always a great chance of different opinions and contributions to the work
④
It is less stressful.
【单选题】
Which of the following is the time when students work in groups?
①
When all the students are under the control of the teacher
②
When students work in pairs on an exercise or a task
③
When students work in small group
④
When students are expected to work on their own at their own speed.
【单选题】
What role does a teacher play in the following activity? The teacher gives students 2 minutes to skim a text, and when time is up, he asks students to stop and answer some questions.
①
Controller
②
Assessor
③
Organizer
④
Prompter
【单选题】
What are the possible roles of a teacher?
①
Controller, assessor
②
Organizer, prompter
③
Participant, resource-provider
④
All of the above.
【单选题】
Which of the following is the time when students study by themselves?
①
When all the students are under the control of the teacher
②
When students work in pairs on an exercise or a task
③
When students work in small groups
④
When students are expected to work on their own at their own speed.
【单选题】
What role does a teacher play in the following activity? When a student has made a sentence with borrow, “I borrowed a paper to write a letter”, the teacher says, “Well, we don’t say a paper, we say a piece of paper.”
①
Controller
②
Assessor
③
Organizer
④
Prompter.
【单选题】
Why do novice teacher often have problems giving clear instructions?
①
Their language proficiency is low
②
They are fresh from the university
③
Their instructions are too short
④
They are not able to target their instructions to the level of the learners.